非稳定电源驱动的恒压绝热压缩空气储能系统设计

Design on Isobaric Adiabatic Compressed Air Energy Storage System for Unstable Input at Power Source-side

典型先进绝热压缩空气储能系统(advanced adiabatic compressed air energy storage,AA-CAES)受限于压气机的稳定工作范围,不适宜作为非稳定电源侧的储能系统。该文提出一种功热并储恒压绝热压缩空气储能系统(isobaric adiabatic compressed air energy storage system integrated with power-thermal combined storage,PT-IA-CAES),在输入功率低于压气机启动功率时,储热系统运行,从而实现储能功率大范围连续可调。其次,阐述该系统的设计方法及其运行规则。通过构建系统部件及整体变工况模型,获得储/释能特性曲线。案例研究表明,电源侧配置的恒压绝热压缩空气储能系统(isobaric adiabatic compressed air energy storage,IA-CAES)与PT-IA-CAES两种设计系统的循环效率分别为69.60%和66.80%,低于AA-CAES的71.83%,但弃风率从4.121%分别降低至1.168%和0.405%,总释能量分别增加48594.33和52137.07MJ,表明所提出的设计系统在应对非稳定电能输入方面具有明显优势。

The typical advanced adiabatic compressed air energy storage(AA-CAES)system has a narrow input power range because of the compressor working stability,and thus it is unsuitable for unstable power source-side energy storage.An isobaric adiabatic compressed air energy storage system integrated with power-thermal combined storage(PT-IACAES)is proposed to cope with fluctuant input power.When the external input power is lower than the compressor startup power,thermal storage system starts to operate,realizing large and continuous energy storage range.The design method and operating rules of the system are expounded.The energy storage/release characteristic curves are obtained by constructing the system components and the overall off-design model.The case study shows that the cycle efficiencies of isobaric adiabatic compressed air energy storage(IA-CAES)system and PT-IA-CAES system at power source-side are 69.60%and 66.80%,respectively,lower than that of AA-CAES(71.83%).However,the wind curtailment rate decreases from 4.121%to 1.168%and 0.405%,respectively,and the total released energy increases by 48,594.33MJ and 52,137.07 MJ,respectively,indicating that the design system has obvious advantages in dealing with unstable power input.